just to keep you updated:
used fastboot to push the stock boot and recovery found in hashcodes tutorial.
kindle now boots up, and isn't sluggish (like it was after trying the root method on this website).
used the onemelia system.img file he includes in his recovery tool for the image.
checking now to see if his system.img did indeed included superuser access. i'll update.
---------- Post added 9th July 2014 at 12:33 AM ---------- Previous post was 8th July 2014 at 11:58 PM ----------
I'm on CM11 now.
the system.img of onemeila is indeed pre-rooted and its 8.1.4
First step for the newest firmware is to revert back to 8.1.4 (with that system img its pre-rooted) and then proceed with the rest of your script.
boot into fastboot> flash onemeila system.img (system1.img in his files)
(turn off wifi, freaking thing updated while i was pushing files, so i had to start from scratch as it killed root)
and then the process as described by hashcode in his tutorial.
hope this helps.